The forger - The viewing of the film "The Counterfeiters" (2007), allows some considerations about the theme of authenticity in therapeutic relationships. This paper proposes differences between falseness and authenticity. Falseness should not necessarily be thought of as reciprocal of authenticity, because falseness can also have an authentic function. It’s proposed, therefore, that authenticity should be considered as a process, while falseness as one of many factors of the process. The process of repetition compulsion (Freud, 1920) shall be considered the reciprocal of the process of authenticity. Key Words: Authenticity; Falseness; Process; Function; Factors.